I agree, it's very similar to what happened with Music (Napster), iTunes made it affordable so people moved to a more reliable source, this evlolved to streaming with Spotify etc. TV and Movies too with their streaming services.
If you look at each of these and the sheer amount of entertainment you could get for what you pay each month, it makes what viewers have to pay for Sky/TNT etc seem even more overpriced. It's no suprise people use dodgy Firesticks instead. If a football streaming package could be provided at a reasonable price on, where you can easily opt in or out rather than having to sign up for the year, then it will be something a lot of people would sign up to.